Epson 20 - Manual (Page 164)

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FLOPPY DISK DRIVE(S) AND CONTROLLER CHECK MENU
1 - Sequential seek check
- Random seek check
- W r i t e , r e a d c h e c k
4 - Run all above checks
0 - Exit
Enter selection number:
Before any checks are performed, the program determines the number
of diskette drives installed in your computer. If you have more than
one drive, you see this prompt each time you select a test:
Check which drive (A/B)?
Press A or B and then Enter. If any errors occur, record the error
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code and message and contact your dealer. Always have the diskette
drive serviced by your dealer or service center.
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Sequential Seek Check
This test checks the ability of the read/write heads to locate any part
of the diskette. This action by a read/write head is called a seek.
During this test, each head seeks sequentially from the innermost
track to the outermost track. The innermost track is track 39 for
360KB diskettes and track 79 for 1.2MB, 720KB, and 1.44MB
diskettes.
Select option I from the menu to start this test. The program displays
the number of each track it finds. For example, with a 360KB
diskette, the first message you see is:
Current track is 39
The track number counts down (from 39 or 79) to 0. The seek is
performed by each head, so you see the count twice. If no errors
occur, the menu displays.
C-20 Performing System Diagnostics